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• Problem in FFMPEG encoding decoding with IPhone os 4.3 SDK

  11 janvier 2012, par IPhoneUprise

  I want to convert my mov file (audio + video) in to mp4 to reduce file size in IPhone. I successfully compile FFMPEG libraries for armv7 for IPhone OS 4.3 sdk and i was able to decode and encode video frames in IPhone. Now my compressed file size reduced from 48 mb mov file to 2 mb mp4 file.But the audio is missing in compressed mp4 file, so now i am trying to decode and encode audio as well but i am getting issues to integrate this audio encode decode code with my existing code. If any one has any sample which shows how to encode decode audio with video that would be great.

• problem ffmpeg batch convert .mkv to .mp4 with subtiles on .mkv file [closed]

  9 décembre 2020, par damvelisa

  I am trying to batch convert a large number of .mkv video files to .mp4 while hard coding the subtitles included in the .mkv files. I would like to retain as much quality as possible.
is use this code but give error

  


   for f in *.mkv; do ffmpeg -i "$f" -vf subtitles="${f%.mkv}" -acodec copy "${f%.mkv}.mp4"; done


  


  this error

  


• What is causing "unspecified pixel format" and "Error opening filters !" error in ffmpeg ?

  19 février 2019, par SJAndersonLA

  I’m writing an mp4 to HLS transcoding process that works as intended on files smaller than 7 gigabytes (sample size is 100 videos). When attempting to transcode anything larger than 7GB, it crashes.

  The command :

  ffmpeg 
  
    -i large_file.mp4 -y 
  
    -vf scale=w=1920:h=1080:force_original_aspect_ratio=decrease 
  
    -c:a aac 
  
    -ar 48000 
  
    -c:v h264 
  
    -profile:v main 
  
    -crf 20 
  
    -sc_threshold 0 
  
    -g 48 
  
    -keyint_min 48 
  
    -hls_time 4 
  
    -hls_playlist_type vod 
  
    -b:v 5000k 
  
    -maxrate 5350k 
  
    -bufsize 7500k 
  
    -b:a 192k 
  
    -hls_segment_filename /1080p_%03d.ts 
  
    -threads 0 
  
    /tmp/output-ef42dc65-1d3d-4682-b32b-68d7c712fb9c-raw-test/1080p.m3u8

  The error :

  ffmpeg version 3.2.12-1\x7edeb9u1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
  
    configuration: --prefix=/usr --extra-version='1~deb9u1' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x555888d821c0] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 1280x720, 3856 kb/s): unspecified pixel format
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'large_file.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.26.101
  
    Duration: 05:56:12.51, start: 0.000000, bitrate: 4061 kb/s
  
      Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none, 1280x720, 3856 kb/s, 29.99 fps, 30 tbr, 100k tbn, 200k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 194 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  [buffer @ 0x555888d88180] Unable to parse option value "-1" as pixel format
  
      Last message repeated 1 times
  
  [buffer @ 0x555888d88180] Error setting option pix_fmt to value -1.
  
  [graph 0 input from stream 0:0 @ 0x555888d81e40] Error applying options to the filter.
  
  Error opening filters!

  The error says to try increasing analyzeduration and probesize, which I set to max value (based on an answer from this post), however that didn’t seem to change the behavior. I also suspected that the file was corrupted, but the fact that this is failing for all files larger than 7GB makes it more difficult to suggest its something not related to the size of the mp4.